Insulator



Jan. 14, 1930. A. NYMAN' 1,743,727

INsULATOR- Filed Sept. .7, 1926 ATTORNEY S open at the top, .where'it is provided. with a" Patented Jan. 14, 1930,

" UNITED STATES PATENT crease ALEXANDER NYM N, or DOIBZBS FERRY, NEW YORK, ASSIGNOR T DUBILIER con-- DENSER CORPORATION, or new YORK, N. Y., A CORPORATION on DELAWARE INSULATOR Application filed-September 7, 1926. Serial No. 133,907.

This invention relates to an improvement in electrical condensers, and particularly to A condensers mounted in casings through which extends a conductor surrounded by suitable insulation. a

An object of my invention is to'provide a condenser in a casing withan insulating cover of superior material. My invention is. fully set forth in the following description,'taken On the drawings:

.Figure l is atop plan of my condenser according to my invention; and F lgure 2 1sa transverse section thereof.

The same numerals-identify the same parts throughout.

On the drawings, the numeral 1 indicates the body of the condenser which may be of .,anysuitable design housed in a casing 2 of metal or other material. This casing is pref erably closed at the sides and bottom, but is shoulder 3. On this shoulder rests an insulating cover 4, and through an aperture in the middle ofthe cover passes a conductor or terminal in the form ofa stem 5, which is preferably threaded and is held in place by nuts 6, gripping the-upper and lowerfface of the coyer 4, these nuts being screwed on the stem 5 and having washers interposed between them and the surface of the cover 4, if necessary, 'i'he condenser may'haveany desired shape, and so may the casing 2,*and

the body of the condenser may be embedded .in wax or any other suitable insulation, filling theinside ofthe casing. One terminal of the condenser may be joined to the casing, and the other terminal, which will of course be a high tension terminal, will-be united to the stem 5 so that connection can be made with the condenser to the operating circuit. a

, On the shoulder 3 I may lay a gasket 7; to engage the lower face of the cover 4 around 7 its peripher'y,and a similar gasket 7 may be laid'on the top of this cover, and a retaining ring 8 held by screws 9 securing the cover and gaskets in place, and sealing up the condenser in the casing-2. I prefer to make the cover 4 of Isolantite or Pyrex glasses, which are silicate compounds having low dielectric losses.- 'These' glasses are much superior to well known insulating substances such as ordinary high grade porcelain and are particularly suited for condenser construction.

For example, thedielectric losses of high grade porcelain is ten times greater than such losses in the silicate compounds men tioned. v

The cover 4 is preferably flat, for ease of manufacture and avoidance of losses.

- Having described my invention, what I believe to be new and desire to secure and pro- 1s The combination of a metallic casing having integral outwardly extending flanges at an open end thereof, a condenser within said casing-said condenser having a terminal comprising a central supporting stud, a flat cover for said casing supported upon and positio-ned by the integral flange of the casing,

and havingan opening through whichthe supporting stud of the condenser may pro- .ject and be supported thereby, a clamping tect by Letters Patent of the United States I member for said cover, a gasket member disposedon either side of the cover at the .pe- 'riphery thereof, the said cover comprising a silicate compound having a low dielectric loss.

L. In testimony whereof I aflix my signature. ALEXANDER NYMAN. A 

